Besilient



M. L. BEAL.

RESILIENT SANDRAPER DRUM.

APPLICATION FILED AUG.I5. 91B- Patented July 29; 1919.

WITNESS:

MICHAEL L. BEAL, or PASADENA, CALIFORNIA.

.RESILIENT SANDPAPER-DRUM.

To all whom it may concern:

Be' it known that 1, MICHAEL L. BEAL, a citizen of the United States, residing at Pasadena, in the county of Los Angeles and State of California, have invented new and useful Improvements in Resilient Sandpaper-Drums, of which the following is a specification.

My invention relates to resilient sandpaper drums, and ,iconsists of the novel features herein shown, described and claimed.

Figure 1 is a side elevation of a traveling sand paper machine having a resilientsandpaper drum embodying the principles of my invention. r

Fig. 2 is a perspective of the resilient sandpaper drum removed from the machine.

Fig. 3 is an enlarged fragmentary longitudinal sectional detail of the resilient sandpaper drum shown in Figs. 1 and 2.

Fig. 4 is a cross sectional detail showing a modified construction.

My resilient sandpaper drum 1 is adapted to be mounted in amachine 2, said machine2 being adapted for traveling upon a floor, or the like, so as to sandpaper'the floor. An electric motor 3 .is mounted upon the machine 2, and the driving belt 4: runs over the motor pulley 5 over the belt tightener pulley 6, and over the pulley 7 carried by the sandpaper drum. The belt tightener 6 is operated by a hand-lever 8, and is held in its adjusted position by a pawl and rack 9.

The details. of the resilient sandpaper drum 1 are as follows: A wooden cylinder 10 is mounted upon a shaft 11. A facing 12 of sponge rubber is placed upon the periphcry of the cylinder 10'. A steelsandpaper backing 13 is placed upon the facing 12, and the sandpaper 14 is mounted upon the backing 13. Radius rods 15 are connected to pintles 16 extending from the ends of the sheet metal backing 13, and pins-17 are inserted through the inner ends of the radius rods 15 into the end of the cylinder 10. The

radius rods 15 are mountfi tangentiallv so- Specification of Letters Patent.

Patented July 29, 1919.

' Application filed August 15, 1918. Serial No. 25 0,033.

sponge rubber backing 12 will yield and allow the sandpaper to pass over the elevation without destroying the sandpaper. In the modification shown in Fig. 4 the sheet metal backing 13 is omitted. The wooden cylinder 20 is mounted upon. the shaft 21. sponge rubber facing 22 is applied to the cylinder 20, and the sandpaper 23 is applied directly to the sponge rubber 22. The construction shown in Fig. 4 makes a softer drum than the construction shown'in Fig. 3, 'but where the floor to be operated upon is reasonably level to start with, and it is desired to make a preferably straight surface and to do hard work the construction shown in Fig. 3 is preferable.

Various changes may be made without departing from the spirit of my invention as claimed.

I claim:

1. A resilient sandpaper drum comprising a cylinder; a facing of sponge rubber applied to the periphery of the cylinder; a

sheet metal backing applied to the sponge backing applied -to the resilient facing;

sandpaper applied to the sheet metal ,hacking; and radius rods pivotally connecting the sheet metal backing to the cylinder.

3. A resilientsandpaper drum comprising, a cylinder, a resilient facing applied to the periphery of the cylinder, a sheet metal backing applied to the resilient facing,.sandpaper applied to the'sheet metal backing, and means connecting-the ends of the sheet metal backing to the ends of the cylinder so as to hold the backing from traveling around, the cylinder.

In testimony 'whereofT have signed my name to this specification. 4

MICHAEL L. BEAL.

The 

